1985 jimmy 2.5 To 4.3 swap

[Clare Royston]

I swapped a 4.3 litre engine into my 85 jimmy witch worked good but had trouble with the carb so i put a throtle body injection system out of an 88 safari van. If i pour gas down the throtle body it runs but i can't seem to get it to fire the injectors to get fuel to it. I have a wiring diagram from both units and it looks to me that all the wires are connected but i must be missing something. Any help would be appreciated. I have the complete wiring harness out of the 88 van including the ECM.